Photodynamical analysis of the triply eclipsing hierarchical triple system EPIC 249432662

Borkovits, T. and Rappaport, S. and Kaye, T. and Isaacson, H. and Vanderburg, A. (2019) Photodynamical analysis of the triply eclipsing hierarchical triple system EPIC 249432662. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 483 (2). pp. 1934-1951. ISSN 0035-8711

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Abstract

Using Campaign 15 data from the K2 mission, we have discovered a triply eclipsing triple star system: EPIC 249432662. The inner eclipsing binary system has a period of 8.23 d, with shallow ̃3 per cent eclipses. During the entire 80-d campaign, there is also a single eclipse event of a third body in the system that reaches a depth of nearly 50 per cent and has a total duration of 1.7 d, longer than for any previously known third-body eclipse involving unevolved stars. The binary eclipses exhibit clear eclipse timing variations. A combination of photodynamical modeling of the light curve, as well as seven follow-up radial velocity measurements, has led to a prediction of the subsequent eclipses of the third star with a period of 188 d. A campaign of follow-up ground-based photometry was able to capture the subsequent pair of third-body events as well as two further 8-d eclipses. A combined photo-spectro-dynamical analysis then leads to the determination of many of the system parameters. The 8-d binary consists of a pair of M stars, while most of the system light is from a K star around which the pair of M stars orbits.

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